diff --git a/src/lib/storage-utils.js b/src/lib/storage-utils.js
index 825f011f6..6ce71f4d3 100644
--- a/src/lib/storage-utils.js
+++ b/src/lib/storage-utils.js
@@ -2,7 +2,7 @@
 
 import _ from 'lodash';
 import crypto from 'crypto';
-import {ErrorCode, isObject, normalize_dist_tags} from './utils';
+import {ErrorCode, isObject, normalizeDistTags, DIST_TAGS} from './utils';
 import Search from './search';
 
 import type {Package, Version} from '@verdaccio/types';
@@ -52,7 +52,7 @@ function normalizePackage(pkg: Package) {
   }
 
   // normalize dist-tags
-  normalize_dist_tags(pkg);
+  normalizeDistTags(pkg);
 
   return pkg;
 }
@@ -71,6 +71,23 @@ function cleanUpReadme(version: Version): Version {
   return version;
 }
 
+export const WHITELIST = ['_rev', 'name', 'versions', DIST_TAGS, 'readme', 'time'];
+
+export function cleanUpLinksRef(keepUpLinkData: boolean, result: Package): Package {
+  const propertyToKeep = [...WHITELIST];
+    if (keepUpLinkData === true) {
+      propertyToKeep.push('_uplinks');
+    }
+
+    for (let i in result) {
+      if (propertyToKeep.indexOf(i) === -1) { // Remove sections like '_uplinks' from response
+        delete result[i];
+      }
+    }
+
+    return result;
+}
+
 /**
  * Check whether a package it is already a local package
  * @param {*} name
diff --git a/src/lib/storage.js b/src/lib/storage.js
index ade687c5f..9792d84df 100644
--- a/src/lib/storage.js
+++ b/src/lib/storage.js
@@ -8,10 +8,10 @@ import ProxyStorage from './up-storage';
 import Search from './search';
 import LocalStorage from './local-storage';
 import {ReadTarball} from '@verdaccio/streams';
-import {checkPackageLocal, publishPackage, checkPackageRemote} from './storage-utils';
+import {checkPackageLocal, publishPackage, checkPackageRemote, cleanUpLinksRef} from './storage-utils';
 import {setupUpLinks, updateVersionsHiddenUpLink} from './uplink-util';
 import {mergeVersions} from './metadata-utils';
-import {ErrorCode, normalize_dist_tags, validate_metadata, isObject, DIST_TAGS} from './utils';
+import {ErrorCode, normalizeDistTags, validate_metadata, isObject, DIST_TAGS} from './utils';
 import type {IStorage, IProxy, IStorageHandler, ProxyList, StringValue} from '../../types';
 import type {
   Versions,
@@ -26,7 +26,6 @@ import type {
 import type {IReadTarball, IUploadTarball} from '@verdaccio/streams';
 
 const LoggerApi = require('../lib/logger');
-const WHITELIST = ['_rev', 'name', 'versions', DIST_TAGS, 'readme', 'time'];
 const getDefaultMetadata = function(name): Package {
   const pkgMetadata: Package = {
     name,
@@ -47,9 +46,6 @@ class Storage implements IStorageHandler {
   logger: Logger;
   uplinks: ProxyList;
 
-  /**
-   * @param {*} config
-   */
   constructor(config: Config) {
     this.config = config;
     this.uplinks = setupUpLinks(config);
@@ -169,9 +165,9 @@ class Storage implements IStorageHandler {
     // trying local first
     // flow: should be IReadTarball
     let localStream: any = self.localStorage.getTarball(name, filename);
-    let is_open = false;
+    let isOpen = false;
     localStream.on('error', (err) => {
-      if (is_open || err.status !== 404) {
+      if (isOpen || err.status !== 404) {
         return readStream.emit('error', err);
       }
 
@@ -202,7 +198,7 @@ class Storage implements IStorageHandler {
       readStream.emit('content-length', v);
     });
     localStream.on('open', function() {
-      is_open = true;
+      isOpen = true;
       localStream.pipe(readStream);
     });
     return readStream;
@@ -214,10 +210,10 @@ class Storage implements IStorageHandler {
     function serveFile(file: DistFile) {
       let uplink: any = null;
 
-      for (let p in self.uplinks) {
+      for (let uplinkId in self.uplinks) {
         // $FlowFixMe
-        if (self.uplinks[p].isUplinkValid(file.url)) {
-          uplink = self.uplinks[p];
+        if (self.uplinks[uplinkId].isUplinkValid(file.url)) {
+          uplink = self.uplinks[uplinkId];
         }
       }
 
@@ -304,28 +300,17 @@ class Storage implements IStorageHandler {
       }
 
       this._syncUplinksMetadata(options.name, data, {req: options.req},
-        function getPackageSynUpLinksCallback(err, result: Package, uplink_errors) {
+        function getPackageSynUpLinksCallback(err, result: Package, uplinkErrors) {
           if (err) {
             return options.callback(err);
           }
 
-          const propertyToKeep = [...WHITELIST];
-          if (options.keepUpLinkData === true) {
-            propertyToKeep.push('_uplinks');
-          }
-
-          for (let i in result) {
-            if (propertyToKeep.indexOf(i) === -1) { // Remove sections like '_uplinks' from response
-              delete result[i];
-            }
-          }
-
-          normalize_dist_tags(result);
+          normalizeDistTags(cleanUpLinksRef(options.keepUpLinkData, result));
 
           // npm can throw if this field doesn't exist
           result._attachments = {};
 
-          options.callback(null, result, uplink_errors);
+          options.callback(null, result, uplinkErrors);
         });
     });
   }
diff --git a/src/lib/utils.js b/src/lib/utils.js
index 8a9036d35..5b14dcc90 100644
--- a/src/lib/utils.js
+++ b/src/lib/utils.js
@@ -247,7 +247,7 @@ function semverSort(listVersions: Array<string>) {
  * Flatten arrays of tags.
  * @param {*} data
  */
-function normalize_dist_tags(pkg: Package) {
+export function normalizeDistTags(pkg: Package) {
 	let sorted;
 	if (!pkg[DIST_TAGS].latest) {
 		// overwrite latest with highest known version based on semver sort
@@ -443,7 +443,6 @@ export {
 	semverSort,
 	parse_address,
 	get_version,
-	normalize_dist_tags,
 	tagVersion,
 	combineBaseUrl,
 	filter_tarball_urls,
diff --git a/types/index.js b/types/index.js
index a22b75025..b7b73e0c5 100644
--- a/types/index.js
+++ b/types/index.js
@@ -70,7 +70,7 @@ export type Utils = {
 	isObject: (value: any) => boolean;
 	validate_name: (value: any) => boolean;
 	tag_version: (value: any, version: string, tag: string) => void;
-	normalize_dist_tags: (pkg: Package) => void;
+	normalizeDistTags: (pkg: Package) => void;
 	semverSort: (keys: Array<string>) => Array<string>;
 }